cobalt Posted April 21, 2010 Report Share Posted April 21, 2010 I just got a Noss Performance cool head with 20 domes, I installed it and am having problems with coolant leaking from around the bolts it starts and runs fine. Just wondering if have any ideas how to fix the leaking coolant I put new o-ring set on it when i installed and I just tried putting a lil high temp gasket silicone on around the bolts and it is still wanting to leak a bit. I'm using stock nuts on it. Quote Link to comment Share on other sites More sharing options...
robert.b.west Posted April 21, 2010 Report Share Posted April 21, 2010 I just got a Noss Performance cool head with 20 domes, I installed it and am having problems with coolant leaking from around the bolts it starts and runs fine. Just wondering if have any ideas how to fix the leaking coolant I put new o-ring set on it when i installed and I just tried putting a lil high temp gasket silicone on around the bolts and it is still wanting to leak a bit. I'm using stock nuts on it. When I put mine back together every time I had to put a little bit on each one of the little o rings. I could never get mine to seal without silicone. I just used the regular blue rtv. Quote Link to comment Share on other sites More sharing options...
dlnoss Posted April 21, 2010 Report Share Posted April 21, 2010 Using the acorn nuts and copper washers should fix it. Do you have the acorn nuts? -David Quote Link to comment Share on other sites More sharing options...
robert.b.west Posted April 21, 2010 Report Share Posted April 21, 2010 Using the acorn nuts and copper washers should fix it. Do you have the acorn nuts? -David This never worked for me. I always had to use silicone on the small one because one or two always leaked if I did not. I used the acorns with copper and the stock with no difference. Quote Link to comment Share on other sites More sharing options...
cobalt Posted April 21, 2010 Author Report Share Posted April 21, 2010 I don't have the acorn nuts I been tryin to look around to see where I can get some havn't had any luck at the local hard ware store. when you guys put the silicone on did you put it on around where the little oring gasket is or on the outside around the threads? Quote Link to comment Share on other sites More sharing options...
SD1026 Posted April 21, 2010 Report Share Posted April 21, 2010 (edited) Any coolhead I put on a shee never leaked unless something was wrong. Are you sure no orings are twisted or shrank due to chemicals getting on them. I usually grease all orings and carefully place them flush where they need to be then tighten to spec in I criscross fashion. Edited April 21, 2010 by SD1026 Quote Link to comment Share on other sites More sharing options...
robert.b.west Posted April 21, 2010 Report Share Posted April 21, 2010 I don't have the acorn nuts I been tryin to look around to see where I can get some havn't had any luck at the local hard ware store. when you guys put the silicone on did you put it on around where the little oring gasket is or on the outside around the threads? I put a little on the o ring gasket. not around the threads. Quote Link to comment Share on other sites More sharing options...
overrevtricky Posted April 22, 2010 Report Share Posted April 22, 2010 Just went through this myself with a Modquad head. Switched the stock nuts with some sexy lookin acorns, traded the copper for brass washers, and used a Permatex non drying gasket maker for threads and I have zero leakage now. Hope this helps man. Quote Link to comment Share on other sites More sharing options...
baker Posted April 22, 2010 Report Share Posted April 22, 2010 Any coolhead I put on a shee never leaked unless something was wrong. Are you sure no orings are twisted or shrank due to chemicals getting on them. I usually grease all orings and carefully place them flush where they need to be then tighten to spec in I criscross fashion. x2, ive never had a cool head leak and i reused the o rings about 3 times never had a problem till i got drunk and pulled the head and lost one big o ring for the thing, just had to order a new o ring kit,lol Quote Link to comment Share on other sites More sharing options...
dajogejr Posted April 22, 2010 Report Share Posted April 22, 2010 Every cool head I've used and or had have leaked (including a stocker I had cut and Oringed for a cub motor) leaked out of one or more of the center 4 bolts. DLNOSS is dead on with new washers, acorn nuts and a dab of RTV on the acorn nut threads. Water seeps up the stud...and acorn nuts with RTV give it nowhere to go. They are metric, I know any Lowes, HomeDepot, Aco, Ace....they all carry them. If you're in the sticks, you might have to hit a metric supply store. Quote Link to comment Share on other sites More sharing options...
camatv Posted April 22, 2010 Report Share Posted April 22, 2010 if the o-ring is on the stud and its against threads it wont seal.. the o-rings on the studs needs to be on the flat surface of the stud.. NEW acorn nuts, and the correct washers should fix it.. and yes as the instructins state use grease, or vasoline to hold the o-rings in place you prbably cannot use too mcuh on them. use yamabond OR import GREY sealers.. if it still leaks.. ( non hardening) if it still leaks after that well sell it and buy a NEW head problem solved! Quote Link to comment Share on other sites More sharing options...
cobalt Posted April 22, 2010 Author Report Share Posted April 22, 2010 thanks guys for all the info, I got some stuff to try out this weekend hopefully it works cause I aint got the cash to buy a new head just bought this one ,used but just got it. Quote Link to comment Share on other sites More sharing options...
J-Madd Posted April 23, 2010 Report Share Posted April 23, 2010 I've used stock nuts and lots of yamabond on the threads with success. It will leak a little at first, then seal when it gets warm. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.